Sometime we got more than one network interface..

let say one Ethernet Card and one wifi cards..

this will show you how to combine this into one.. and

get better throughout speed.

1. edit /etc/modprobe.conf to add bonding interface.

modprobe.conf
alias bond0 bondingoptions bond1 mode=1 miimon=100

2. edit some of the networking scripts with these :

cd /etc/sysconfig/network-scripts
touch ifcfg-bond0
vi ifcfg-bond0

add these lines.

ifcfg_bond0
DEVICE=bond0
USERCTL=no
ONBOOT=yes
BROADCAST=192.168.100.255
NETWORK=192.168.100.0
NETMASK=255.255.255.0
GATEWAY=192.168.100.1
IPADDR=192.168.100.21

 and..
vi ifcfg-eth0

add..

ifcfg_eth0
DEVICE=eth0
USERCTL=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
HWADDR=00:0c:29:30:41:de
ONBOOT=yes

and

vi ifcfg-wlan0
ifcfg_wlan0
DEVICE=wlan0
USERCTL=no
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
HWADDR=0c:0c:29:30:41:de
ONBOOT=yes

to start using it..

bringing up bond0 interface
ifup bond0

.. it should enslave both network cards..

and determine the ip  address..